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1光纤通信目前国际上普遍采用的是五次群系统，传输速度565Mb／S，正在研究六次群、七次群系统，传输速率1．7Gb／8（或2．4Gb／8）和10Gb／S，甚至还在研究40Gb凡的系统。如能研制成功，则通信距离可扩展到几千公里（目前只有300Km）。2卫星通信卫星通信的特点是通信里高远、
1 Optical fiber communication At present, the five-group system is widely used in the world. The transmission speed is 565Mb / s. Six-group and seven-group systems are being studied. The transmission rate is 1.7Gb / 8 (or 2.4Gb / 8) and 10Gb / S, and even still studying 40Gb where the system. If developed successfully, the communication distance can be extended to a few thousand kilometers (currently only 300Km). 2 satellite communication Satellite communication is characterized by lofty communications,